Quick start to making it possible to use healing items, or any item really. Going with a style that it has to be on your toolbar to use it, and the toolbelt looks in your inventory to see ifyou have healing items.

events.hpp

@@ -7,7 +7,7 @@ namespace Events {
     ATTACK, NEW_RITUAL,
     UPDATE_SPRITE, ENTITY_SPAWN, NOOP,
     LOOT_ITEM, LOOT_CONTAINER,
-    LOOT_CLOSE, LOOT_SELECT, INV_SELECT, AIM_CLICK
+    LOOT_CLOSE, LOOT_SELECT, INV_SELECT, AIM_CLICK, USE_ITEM
   };
 
   struct Combat {

gui/combat_ui.cpp

@@ -3,6 +3,7 @@
 #include "rituals.hpp"
 #include <fmt/xchar.h>
 #include "gui/guecstra.hpp"
+#include "inventory.hpp"
 
 namespace gui {
   using namespace guecs;
@@ -13,7 +14,7 @@ namespace gui {
     $gui.position(COMBAT_UI_X, COMBAT_UI_Y, COMBAT_UI_WIDTH, COMBAT_UI_HEIGHT);
     $gui.layout(
         "[button_0 | button_1 | button_2 | button_3"
-        "|button_4 | button_5 | button_6 | hp_gauge ]"
+        "|button_4 | button_5 | button_6 | healing_button | hp_gauge ]"
         );
   }
 
@@ -63,6 +64,19 @@ namespace gui {
       }
     }
 
+    auto healing_button = $gui.entity("healing_button");
+    auto& inventory = $level.world->get<inventory::Model>($level.player);
+
+    if(inventory.has("pocket_l")) {
+        auto healing_item = inventory.get("pocket_l");
+        $gui.set<Icon>(healing_button, {"healing_potion_small"});
+        $gui.set<Clickable>(healing_button,
+            guecs::make_action($level, Events::GUI::USE_ITEM, {healing_item}));
+    } else {
+      $gui.remove<Icon>(healing_button);
+      $gui.remove<Clickable>(healing_button);
+    }
+
     auto hp_gauge = $gui.entity("hp_gauge");
     $gui.set<Sprite>(hp_gauge, {"stone_doll_cursed"});
     $gui.set<Clickable>(hp_gauge,

gui/fsm.cpp

@@ -503,6 +503,11 @@ namespace gui {
         case eGUI::STAIRS_DOWN:
           event(Event::STAIRS_DOWN);
           break;
+        case eGUI::USE_ITEM: {
+            auto what = std::any_cast<DinkyECS::Entity>(data);
+            dbc::log(fmt::format("USE ITEM: {}", what));
+            break;
+         }
         case eGUI::DEATH: {
             $status_ui.update();
             if(entity != player.entity) {

worldbuilder.cpp

@@ -184,7 +184,7 @@ void WorldBuilder::configure_starting_items(DinkyECS::World &world) {
   world.make_constant(torch_id);
 
   auto healing = System::spawn_item(world, "POTION_HEALING_SMALL");
-  inventory.add("hand_l", healing);
+  inventory.add("pocket_l", healing);
   world.make_constant(healing);
 }